The biggest suggestion we get and the largest user experience improvement we could suggest would be to allow users to be able to drag the image when zoomed in instead of being forced to use the scroll bars.

This accompanied with the ability to pinch and zoom while viewing documents on a mobile device would make the product much easier to interface with.

As you know, the front end document viewer applications are completely open source therefore we warmly welcome the developers who want to contribute their work. Similarly, if you have any solution implemented at your end then you can create a pull request to the official repository of GroupDocs.Viewer for .NET.

However, I am also logging a request of this new feature in GitHub issues. You can follow this link for any further updates.